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Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
A light, relatively hard yet fragile mineral, sodalite is named after its sodium content; in mineralogy it may be classed as a feldspathoid. Well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches.
Ammolite is an opal -like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America. It is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite, the same mineral contained in nacre, with a microstructure inherited from the shell.
If you've got fond memories of blowing into video game cartridges, you've got Gerald "Jerry" Lawson to thank. As the head of engineering and marketing for Fairchild Semiconductor's gaming outfit ...
For many, game development seems like an unreachable dream. We envision a world where we can come up with an idea, hunch over a laptop, bang out some code and – voila – video game. Tom Francis ...
Though it may seem tailor-made for it, a Rare staffer has confirmed that Viva Pinata won't be getting any downloadable content. In response to a fan's question in the "Scribes" column on the ...
PETA satirical browser games. The title screen of Pokémon Black and Blue, a parody of Pokémon Black 2 and White 2. Injured Pokémon from left to right: Oshawott, Snivy, Tepig, and Pikachu. People for the Ethical Treatment of Animals (PETA), an animal rights organization based in the United States, has released a number of browser games on its ...
Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no significant selenium – The similar names both derive from Greek selḗnē ...